Protonation effects on the photophysical properties of poly(2,5-pyridine diyl)

AP Monkman, M Halim, Ifor David William Samuel, LE Horsburgh

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

We have recently shown that poly(2,5-pyridine diyl) (PPY) can be synthesized to yield a polymer with high photoluminescence quantum yield (PLQY) in the solid state, and that it is an excellent electron transport material. To explore the photophysical properties of PPY further, we have used a range of acidic "dopants" to protonate the nitrogen sites on each ring and made observations on how this affects the optical properties of the resultant protonated PPY films. In general, we find that sulphonic acids have the greatest effect, causing perturbations to both the ground-state and excited-state properties of the PPY. These changes occur with only moderate reduction of the PLQY, whereas nonsulphonic acids cause a larger reduction in PLQY without significantly affecting the ground- or excited-state energy levels. These aspects of the photophysics of PPY can be described using a simple ring torsion argument. This model can also account for the observed shifts between solution state and solid-state emission wavelengths. (C) 1998 American Institute of Physics. [S0021-9606(98)70147-3].

Original languageEnglish
Pages (from-to)10372
Number of pages10372
JournalJournal of Chemical Physics
Volume109
Publication statusPublished - 15 Dec 1998

Keywords

  • PYRIDINE-BASED POLYMERS
  • CONJUGATED POLYMERS
  • CONDUCTIVITY
  • POLYANILINE
  • PHOTOLUMINESCENCE
  • POLY(P-PYRIDINE)

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